We report a new Rb-Sr isochron age of 64.9 +/- 0.8 Ma for the West Coast lamprophyre at Murud, south of Mumbai and trace element and Sr isotopic composition (0.70384-0.70419) for alkaline, ultrapotassic and basic suites of dykes NE of Kalyan near Mumbai intruding the Deccan basaltic flows. The age of lamprophyre is synchronous with the bulk of the Deccan Trap activity and nearly coincides with the K/T boundary. Also, the initial Sr isotopic composition is similar to the Deccan and Reunion basalts suggesting a genetic connection to the Reunion plume.